Question

:. A bus decreases its speed from
80 km h-1 to 60 km hl in 5 s.
Find the acceleration of the bus.​

Answer 1

Answer:

Explanation:

Hope this helps you....

Answer 2

If you subtract the speeds, you get that it drops 20 km/h (speed change of -20 km/h) in 5 s, thus its acceleration is found by dividing that speed change by the time interval, thus it is -4 (km/h)/s, negative because it’s slowing.

Now that is a kind of interesting mixed unit involving two incoherent time units - in full metric (SI), we use m/s for speed (metres per second, equivalently, km/ks - kilometres per kilosecond, to make it in a more “road”-friendly format). Your 20 km/h speed drop comes to an ~5.6 m/s speed drop (divide by 3.6, since there’s 3.6 ks in an h, exactly), and thus the acceleration is seen to be about -1.1 m/s^2 in more proper units